password is not accepted

[umar185]

I entered the root password for upgrading my system and it says password is incorrect , while the password works fine for installing packages please help me on this.

[Gödel]

where does it say password is incorrect? what app are you running?

can you login as root using 'su -' ?

if not, boot to runlevel 1 by adding 1 to kernel boot line at grub boot screen and change password with 'passwd' command